Showerhead unit



FIG. 1 is an isometric bottom view of a showerhead unit showing the new design.

FIG. 2 is an isometric top view of the new design.

FIG. 3 is a front view of the new design.

FIG. 4 is a rear view of the new design.

FIG. 5 is a right side view of the new design.

FIG. 6 is a left side view of the new design.

FIG. 7 is a top view of the new design; and,

FIG. 8 is a bottom view of the new design. 

We claim the ornamental design for a showerhead unit, as shown and described. 